The earthquake is the vibration that occurs in the earth's surface. Ordinary earthquakes caused by the movement of the earth's crust (plates of the earth). Our earth, although solid, always moving, and earthquakes occur when the pressure is because the movement was already too large to be arrested.
Anatomy of an earthquake
Earthquakes occur every day on earth, but most are minor and do not cause damage to anything. Small earthquakes can also accompany a major earthquake, and can occur after, before, or after the big earthquake.
The cause of earthquakes
Most earthquakes result from the release of energy generated by the pressure made by the moving plates. The longer the pressure was becoming enlarged and eventually reach the state where the pressure can not be arrested again by the edge of the plate. At that moment an earthquake is going to happen. Earthquakes usually happen at plate boundaries plates.
